OptiFine HD 9minecraft — Guide

Key Features

• Massive FPS boost – a modern rendering engine dramatically increases frame rates and reduces lag spikes.
• Shader support – load your favorite shader packs for realistic lighting, shadows, water and skies.
• Zoom – hold a key to zoom in, just like the classic OptiFine zoom.
• Fullbright – brighten the world so caves and night are fully visible.
• Connected textures (CTM) – seamless glass and blocks with supported resource packs.
• Custom entity models & textures (CEM/CET) – resource packs can reshape and retexture mobs.
• Advanced video settings – fine-grained options for clouds, fog, particles and more.
• Great mod compatibility – designed to run alongside the vast majority of popular mods.

Controls & Usage

• Zoom: hold the Zoom key (default C) while in-game to zoom in; release to zoom out. You can rebind it under Options → Controls.
• Fullbright: bind the Fullbright key under Options → Controls, then press it to toggle full brightness.
• Video settings: open Options → Video Settings for the expanded performance and quality options.

Using Shaders

1. Download a shader pack (a .zip file).
2. In-game, open Options → Video Settings → Shaders and click the shader-packs folder button.
3. Drop the shader .zip into that folder.
4. Select the pack from the list to enable it. Choose a lighter pack if your FPS drops too much.

Performance Tips

• Start without shaders to enjoy the pure FPS boost, then add shaders if your hardware allows.
• Lower render distance and disable heavy effects (fog, extra particles) in Video Settings for weaker PCs.
• Keep your graphics drivers up to date for the best results.